title: [Seasonal changes and response to stress of total flavonoids content of Farfugium japonicum].
abstract: OBJECTIVE
  To investigate the seasonal variation of total flavonoid content of Farfugium japonicum and its response to stress.
  
  
  METHODS
  The total flavonoids of Farfugium japonicum were determined by spectrophotometry in different seasons and under various stressful factors.
  
  
  RESULTS
  The total flavonoid content in Farfugium japonicum leaves was the highest, followed by the petiole, and rhizomes (P<0.05). The total flavonoid content in the leaves in December was higher than that in other months; that in the petiole and rhizome fluctuated in different seasons (P<0.05). As the light intensity enhanced, the total flavonoids in Farfugium japonicum leaves, petioles, rhizomes showed a downward trend. With the increase of water stress, the total flavonoid content in Farfugium japonicum leaves gradually increased, that in petiole first increased and then decreased,while that in rhizomes decreased (P<0.05). With the salt stress, the total flavonoid content in leaves, petioles and rhizomes of Farfugium japonicum showed a decreasing trend (P<0.05). With the increasing of temperature, the total flavonoid content in the leaves showed a gradually increasing trend; that in petiole first decreased and then increased,while that in the rhizomes first increased and then decreased (P<0.05).
  
  
  CONCLUSIONS
  The total flavonoids of Farfugium japonicum fluctuate with the change of seasons and that in different parts of the plant has different responses to ecological stressful factors.
authors.affiliation: Marine Science College, Zhejiang Ocean University, Zhoushan 316004, China.
authors.forename: Dalian
authors.initials: D
authors.lastname: Cui
authors.forename: Yuxin
authors.initials: Y
authors.lastname: Ma
mesh_terms: D019659:Asteraceae / Q000737:chemistry*; D005419:Flavonoids / Q000032:analysis*; D012621:Seasons; D013312:Stress, Physiological
chemical_list: D005419:Flavonoids